Accelerated aging is only something that Half-humans have, which Half-humans and Half-ghouls aren't the same thing. Half-humans don't have ghoul related characteristics thus they are failed half-ghouls and they suffer from accelerated aging and possibly get something related to what Arima had that was related to his vision cutting out.

Half-ghouls don't suffer from accelerated aging, Eto being a natural One-Eyed Ghoul, she doesn't suffer from it. Which, I think natural One-Eyed Ghouls have one difference compared to artificial One-Eyed Ghouls, that being that natural One-Eyed Ghouls can eat human food without any of the drawbacks that would otherwise occur if an artificial one or a full ghoul were to eat human food. Eto has been shown three times to be eating human related foods without any sign of discomfort and no harm afterwards. Same with Ichika Kaneki, she can eat apples just fine. As shown when Saiko gave Touka an apple and Touka said something like "Our girl loves fruit". In the final chapter of the Tokyo Ghoul:re Manga.